COCHLOSTYLA OF MINDORO PROVINCE 



461 



Shell of medium size, very elongate-ovate. Nuclear whorls pale 

 buff. Postnuclear whorls yellow with an olivaceous tinge. Occa- 

 sional varicial streaks of darker shades are present. The coloration 

 appears to be solely confined to the periostracum, for where this is 

 removed the shell appears white below. There is a narrow light zone 

 at the summit. Interior of aperture, expanded peristome, and columella 

 bluish white. Nuclear whorls 2.5, forming a rather pointed spire. 

 Postnuclear whorls slightly rounded, appressed at the summit, marked 

 by retractively slanting lines of growth and closely approximated mi- 

 croscopic spiral striations, which are present on both spire and base. 

 The suture is very slightly impressed. The periphery is obsoletely 

 angulated. The base is rather produced and moderately rounded. 

 The aperture is auricular; the outer lip is broadly expanded and re- 

 flected, and the columella likewise is broadly expanded at its insertion 

 and reflected over the base, leaving a narrow umbilical chink. 



The type (U.S.N.M. 313672), collected by Quadras at Bulalacao, 

 southeastern Mindoro, has 6.2 whorls and measures: Length, 45.8 

 mm; greater diameter, 22 mm; lesser diameter, 17.9 mm. 



An additional series of specimens, some with localities and some 

 without localities, but all from southeastern Mindoro, yields the 

 following measurements: 



1 Topotype. 



